Pallbearers carry the casket of late Supreme Court Justice Antonin Scalia up the steps of the Basilica of the National Shrine of the Immaculate Conception, on Feb. 20, 2016 in Washington, D.C.

Scalia's sons and sons-in-law served as pallbearers to carry his flag-draped casket into the Basilica of the National Shrine of the Immaculate Conception for a funeral Mass honoring the late jurist who died unexpectedly last weekend.

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In a hallowed place where popes have prayed and pilgrims have flocked, mourners gathered Saturday at the nation's largest Catholic church to pay their final respects to Scalia.

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A clergy member walks out of security screening prior to the funeral services.
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Scalia's casket arrived at the basilica after he lay in repose at the Supreme Court on Friday, where thousands of visitors came to honor one of the country's most influential conservatives.
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Republican presidential candidate, Sen. Ted Cruz, R-Texas, takes his seat prior to the funeral. Cruz interrupted his campaign ahead of Saturday's South Carolina primary to attend the Mass. The Texas senator has been among those urging the Senate not to consider replacing Scalia until after the November presidential election. Obama has insisted that he will nominate a successor.
Doug Mills / The New York Times via AP, pool

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Former Vice President Dick Cheney, front left, and Supreme Court Justice Clarence Thomas, center rear, greet other mourners before the funeral. Dignitaries including Vice President Joe Biden, Cheney, members of Congress and all eight sitting justices of the Supreme Court were among those attending.
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Scalia's casket is carried into the church during the procession.
Doug Mills / The New York Times via AP, pool

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Guests look to the procession during the funeral mass.
Doug Mills / The New York Times via AP, pool